Coils used in intravascular treatment

Abstract

A complex coil for intravascular treatment, a mandrel for constructing the complex coil, and the method for constructing the complex coil is disclosed. The coil generally comprises a primary wire formed to a primary spring and then formed to a secondary three dimensional shape, wherein the primary spring forms a secondary set of layers of successive loops. A fixed number of loops define a layer forming a locus of points enclosing a generally spherical surface and forming a repeatable pattern, the second successive layer of loops of the repeatable pattern being generally larger in diameter and spherical size than the previous layer. The locus of the points from the four or more loops define an enclosed spheroid adapted to fill or frame an embolism wherein the size and geometry of the successive loops can be manipulated by various means of the unique design of the mandrel.